Owner's manual

Using Post Milling Cycles
Chapter 23
23-8
Important: Tool length, work coordinates, and diameter offsets must be
entered and active prior to the G88 block. The radius/diameter of the tool
can not exceed the length of the shortest side of the pocket. If it does, the
control enters Cycle-Stop mode and displays the error message “TOOL
RADIUS TOO L ARGE.”
These features are prohibited during execution of pocket milling cycles:
MDI m ode
Tool offset changes through the offset softkey
Work coordinate offset changes through the offset softkeys
The following subsections cover using the G88.4 finishing cycle for
rectangular or circular posts.
Use the G88.4 post milling finishing cycle to finish a rectangular post in a
workpiece. This cycle is typically used to remove the finish allowance that
was left on the sides of a rectangular post during a G88.3 cycle.
The G88.4 block used to finish a rectangular post has this format:
G88.4 X__Y__Z__I__J__Q__(,R or ,C)__P__H__L__F__;
Where : Is :
XY
The coordinates thatspecify the centeroftherectangularpost.
Z
The coordinate (along the plungingaxis)thatspecifies the bottomofthe rectangularpocket. In
incremental mode this parameter specifies the depth ofthe pocketasmeasured fromthe startlevel
to the pocketbottom. Thisparametermustbe programmed.
IJ
The length ofthepost’ssides. Ispecifies the length oftheside paralleltotheXaxis. J specifies
the length ofthe sideparallel to the Yaxis. These are unsignedincremental values.
Important: Itisassumedthat Iand Jareassigned in AMP as the integrandaxisnamesthat
correspond totheX andYaxes respectively.
Q
Unsignedincremental valuethatspecifies the distance fromthe sides ofthe postto the outer
perimeterofthe pocket. This distanceisthesamewhethermeasuredalong the Xorthe Yaxis.
,R
Corner radius. This isan optionalparameterthatis used to programroundedpostcorners.
,C
Corner chamfer. This is anoptionalparameterthatis used to programchamferedroundedpost
corners.
Important: In ordertoprogramrounded or chamfered cornerstheChamfering and Corner
Radiusoption mustbe installedin the control.
P
Directionoffinishingcut. This parameterdetermineswhether the finishing cuts are performed ina
clockwise orcounter-clockwise motion. P0 specifiesclockwise. P1 specifiescounter-clockwise.
Important: Ifcuttercompensation(G41/G42)was enabled priortotheG88.4block,itis
disabledwhen G88.4is enabled.
H
The finishallowancethatwill be lefton the sidesofthe post. Thisisan optional parameterthatis
provided to allowfor multiple finishingcuts.
23.2.1
Rectangular Post Finishing
Using G88.4